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Bottom adjustment rollers with wide center groove. 1-1/2 In. nylon ball bearing rollers. Steel inner race with 1/4 In. hole. Bottom adjustment rollers with wide center groove. 1-1/2 In. nylon ball bearing rollers. Steel inner race with 1/4 In. hole. To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.

